Parkinson-Cowan laboratory gas test meter, wet, no.1005, 1945. Parkinson-Cowan laboratory gas test meter
Parkinson-Cowan laboratory gas test meter, wet, serial no.B1605, c. 1965, portable with adjustable levelling feet, 0.5 litres per revolution, painted bright green, rev. counter inset in dial, water level indicator on right hand side, spiit level and carrying handle on top. Parkinson-Cowan laboratory gas test meter
Parkinson-Cowan laboratory gas test meter, wet, no. 1073, c. 1965. Parkinson-Cowan laboratory gas test meter
Wet, laboratory test gas meter made by Scientific & Projections Ltd from a non-magnetic metal/alloy (brass?) painted green, date 1930-1950, with MofP33 lead seal tag. Large sweep hand to circular clock-face dial measuring 1/2 cu ft/rev. (Tingley catalogue No. 239). Wet, laboratory test gas meter made by Scientific 1930-1950
Wet, laboratory test gas meter made by Scientific & Projections Ltd from a non-magnetic metal/alloy (brass?) painted grey, date 1930-1960. Large sweep hand to circular clock-face dial measuring 1/2 cu ft/rev. (Tingley catalogue No. 243). Wet, laboratory test gas meter made by Scientific 1930-1960